"No, I think it's an important state for us. We need to be able to compete here, and we will and pick up delegates here, and we will. But you know, make or break, I don't kind of look at things as make or break. It's one foot in front of the other. It's ... going to the White House is like climbing Mount Everest. There's never one make or break unless you fall off the ledge. It's just one foot in front of the other and that's the way we're proceeding," Kasich said.

Cruz will be at the Country Springs Hotel in Pewaukee on Wednesday night, but the senator's wife, Heidi Cruz, got a jump start on the campaigning.

Wednesday morning, she helped open up the Cruz campaign office in Waukesha.

A short time later, she moved on to the Machine Shed in Pewaukee for a meet and greet.

One of the top political blogs, FiveThirtyEight, is saying Cruz has a 60 percent chance of winning the Wisconsin primary. His wife said meeting with voters helps their chances.

"It has been the singular honor of this campaign to get to know our fellow Americans and when we go remind our fellow Americans that we all have the same shared values of opportunity for our kids to reduce our debt and deficit so we don't bankrupt our country," Heidi Cruz said.

Heidi Cruz has also been the focus of conversation over the last 24 hours. She's been the subject of a Twitter war between Donald Trump and Ted Cruz.

"We will not stoop to the level of Donald Trump. This campaign is about a positive optimistic agenda. As you may know by now, there are a lot of things Donald Trump and his campaign say that have no basis in reality," Heidi Cruz said.

On the Democratic side, Hillary Clinton is also eyeing Wisconsin.

Her daughter, Chelsea Clinton, will makes stops in Milwaukee, Waukesha and Madison on Thursday.